Brightening agent



UNITED STATES PATENT OFFICE.

an'rnua WHITE YOUNG, or KO comm, or KoxoMo,

No Drawing.

To all whom it may 0 Be it known that KOMO, INDIANA, AS-SIGNOR TO UDYLITE PROCESS INDIANA, A CORPORATION OF INDIANA.

BRIGHTENING AGENT.

Application filed June 12, 1924. Serial No. 719,664.

oncem:

I, ARTHUR \Vnrrn YOUNG, a citizen of the United States, re-

siding at ard and State of Indiana,

Kokomo, in the county of Howhave invented certain new and useful Improvements in Brightening Agents, is a specification.

of which the following It has been found that in the electroplatin of cadmium from cyanide solutions P milk added to the plating bath in small quantities as an addition or brightening agent gives very milk may satisfactory be used either in its raw form results. The

or in concentrated form, as inrthe commercial condensed and eva 1s, many form in whic the calcium caseinogenate content is in its original soluble form.

Either the sweetened so-called condensed milk or the unsweetened so-called evaporated. milk maybe used, but I prefer the unsweetened evaporated milk which, as is well known,

is prepared ordinarily evaporating raw milk under reduced pressure to about one-half its original volume and then subjecting sealed cans.

Milk contains several which besides water casein and milk sugar. whether the proper-tie it to sterilization in materials, among are the butter fats,

I am unable to state s of milk as an addition agent are due to any one of the components of the milk or tion. The fact that milk in which the cal-- has not been precipicium caseinogenate to their combined actated gives results superior to those produced by the use of casein dissolved in alkali, would seem to indicate that the casein in its natural .soluble form is the active agent,

but it may be that the other components of the milk have a cooperative effect.

The quantity of milk used may for instance,

a very wide range,

from .5, to

'40 c. c. of unsweetened milk which has been concentrated to about one-half of its orig1- orate'd milks, that vary overnal volume per gallon of electrolyte. An average preferred addition is about 10 c. c. of the unsweetened concentrated milk per gallon of electrolyte.

The milk brightening agent may be used in any suitable cadmium cyanide plating bath, the composition of which may vary from say 4 to 6 from to 10 ounces er gallon.

The following vention:

To a. -gallon bath containing approximately 2 ounces of cadmium and 5 ounces of sodium cyanide per gallon there is added 400 c. c.' of unsweetened half-volume concentrated milk and the bath is used for electroplating in' the usual way.

Condensed milk may be used in substantially the same quantities as those stated for evaporated milk and raw milk may be used in approximately twice the quantities specified for evaporated milk.

I claim :-v

1. Method of obtaining bright, dense, coherent deposits of cadmium. upon another metal, which comprises 'electro'depositin cadmium from a solution thereof to whic a relatively small amount of concentrated milk has been added.

2. Method as defined in claim 1 in which the solution of cadmium is a cyanide soluof free sodium cyanide example illustrates the in- ,tlOIl.

' 3. Method as defined in claim 1 in which the concentrated milk is unsweetened halfvolume evaporated milk.

4. Method of obtaining bright, dense, coherent deposits of cadmium upon another metal, which comprises electro-depositing cadmium from a cyanide solution to which a relatively small amount of unsweetened half-volume evaporated milk has been added.

In testimony whereof, I aflix my signature.

ARTHUR WHITE YOUNG.

ounces of cadmium and 

